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/* Error-checking wrapper for sysconf.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <support/check.h>
#include <support/xunistd.h>
long
xsysconf (int name)
{
/* Detect errors by a changed errno value, in case -1 is a valid
value. Make sure that the caller does not see the zero value for
errno. */
int old_errno = errno;
errno = 0;
long result = sysconf (name);
if (result == -1 && errno != 0)
FAIL_EXIT1 ("sysconf (%d): %m", name);
errno = old_errno;
return result;
}
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